The Seiko 1E20-0770 is a watch model based on the 1E20 movement.
Parts List
| 120N14JK01 | crystal |
| 30M98NA1 | crown |
| 0H1100B01 | case back gasket - case back gasket |
| TT61A | band - metal band |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 82821920 | others - case ring |
| 1E200770 | others - case back |
| 1E20077026 | others - case |
| 1E202330XS14 | others - dial |
| 1E208 | others - machine code |
| 04VB0DGM | others - minute hand |
| 0351931 | others - winding stem |
| 04VB0NGH | others - hour hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
